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- W2895928534 endingPage "2064" @default.
- W2895928534 startingPage "2039" @default.
- W2895928534 abstract "Identifying galaxies in hydrodynamical simulations is a difficult task, particularly in regions of high density such as galaxy groups and clusters. We present a new scale-free, shape-independent algorithm to robustly and accurately identify galaxies in simulations, implemented within the phase-space halo-finder code velociraptor. This is achieved by using the full phase-space dispersion tensor for particle assignment and an iterative adjustment of search parameters, which help us overcome common structure-finding problems. We apply our improved method to the Horizon-AGN simulation and compare galaxy stellar masses (M*), star formation rates (SFRs), and sizes with the elaborate configuration-space halo-finder halomaker. Galaxies living in haloes with >1 galaxy are the most affected by the shortcomings of real-space finders, with their mass, SFR, and size being >2 times larger (smaller) in the case of host (satellite) galaxies. Thus, our ability to measure minor/major merger rates and disentangle environmental effects in simulations can be generally hindered if the identification of galaxies is not treated carefully. Though large systematic differences are obtained on a one-to-one basis, the overall galaxy stellar mass function, the SFR function, and the mass–size relations are not greatly affected. This is due to isolated galaxies being the most abundant population, dominating broad statistics." @default.
- W2895928534 created "2018-10-26" @default.
- W2895928534 creator A5003375657 @default.
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- W2895928534 creator A5060297317 @default.
- W2895928534 creator A5075521248 @default.
- W2895928534 creator A5082883112 @default.
- W2895928534 date "2018-10-08" @default.
- W2895928534 modified "2023-10-15" @default.
- W2895928534 title "Introducing a new, robust galaxy-finder algorithm for simulations" @default.
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- W2895928534 doi "https://doi.org/10.1093/mnras/sty2725" @default.